spirv-llvm-translator: Upgrade to 21.1.1
Backports following fixes to 21 branch
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29758b55 [Backport to llvm_release_210] Fix error propagation in parseSPIRV (#3365)
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615cc15b Fix BFloat16 mangling (#3355)
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9aae1acb [Backport to 21] Implement SPV_INTEL_bfloat16_arithmetic (#3290)
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b50fc5ca [Backport to 21] Support for SPV_INTEL_shader_atomic_bfloat16 extension (#3343) (#3349)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>